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MC34703PNB bảng dữ liệu(PDF) 3 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
3
34703
PIN CONNECTIONS
PIN CONNECTIONS
Figure 3. 34703 Pin Connections Bottom View
Table 1. 34703 Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on page 15.
Pin Number
Pin Name
Pin Function
Formal Name
Definition
1
VBST
Input
Boost Voltage
Input for internal boost regulator. The internal boost regulator provides
8 V (at up to 45 mA current) to supply the gate drive circuits for the
integrated power MOSFETs and the external N-channel power MOSFET
of the linear regulator.
2
EN2
Input
Enable Pin 2
Enable 2 Input. The combination of the logic state of the Enable 1 and
Enable 2 inputs determine operation mode and type of power sequencing
of the IC.
3
CLKSEL
Input/Output
Clock Selection
This pin sets the CLKSYN pin either as an oscillator output or
synchronization input pin. The CLKSEL pin is also used for the I2C
address selection.
1
2
34567
89
10
11
12
13
14
15
16
17
18
19
20
21
22
33
32
26
23
24
28
29
30
27
VIN2
SW
SW
PGND
COMP
INV
BOOT
SR
NC
(Heatsink Only)


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